Answer:
Metaphor
<h2>What is a metaphor?</h2>
A figure of speech in which a term or phrase is applied to something to which it is not literally applicable in order to suggest a resemblance, as in "A mighty fortress is our God."
In the sentence, "My son is a greyhound out of the blocks when it's hometime," the son is being compared to this because of how fast he runs to get home.
Hence, the technique used in the phrase, "My son is a greyhound out of the blocks when it's hometime" is a metaphor.
The synonym of glib would be insincere...
if you look up the definition in the dictionary it tells you that glib refers to someone that is insincere
hope this helps :)
"The sensation developed into pain that grew acute. And still he endured it, holding the flames of matches clumsily to the bark that would not light readily because his own burning hands were in the way, absorbing most of the flame."